Well-X-Trol Tank Size

I have a 3/4 HP submersible pump that pumps 10 GPM and my pressure switch is set and 30/50. I currently have an old (1993ish) flotec 50 gallon bladder tank that I pretty sure is waterlogged. I drained all the water out turned off the pump and checked the air pressure. Nothing. So I aired it up to 28 psi. It won't last long so I'm going to get a new tank. I've done research and it seems the well-x-troll tanks are the best. Should I get the 44 gallon or the 62 gallon?